[Custom Scheme] Remove 'title' parameter in the tests of unregisterProtocolHandler

Thgough IDL defined unregisterProtocolHandler with 2 arguments, unregister-protocol-handler.html
has tested it with 3 parameters. Thus this CL removes the title parameter in the tests.

- void unregisterProtocolHandler(DOMString scheme, USVString url);

Spec: https://html.spec.whatwg.org/multipage/webappapis.html#custom-handlers

Bug: None
Change-Id: I544d0027f90a25d517b77633bf50a726ee1b364c
Reviewed-on: https://chromium-review.googlesource.com/790018
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung.kim@lge.com>
Cr-Commit-Position: refs/heads/master@{#519457}
1 file changed